Solar hybrid steam injection gas turbine (STIG) cycle

► Solar steam can augment steam injection gas turbine (STIG) plants, with Solar Fraction up to 50%. ► Low-cost concentrating collectors such as linear Fresnel can provide the needed steam conditions. ► Efficiency from heat (average of fuel and solar) to electricity can be in the range 40–55%. ► Very...

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Veröffentlicht in:Solar energy 2012-01, Vol.86 (1), p.190-199
Hauptverfasser: Livshits, Maya, Kribus, Abraham
Format: Artikel
Sprache:eng
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Zusammenfassung:► Solar steam can augment steam injection gas turbine (STIG) plants, with Solar Fraction up to 50%. ► Low-cost concentrating collectors such as linear Fresnel can provide the needed steam conditions. ► Efficiency from heat (average of fuel and solar) to electricity can be in the range 40–55%. ► Very low water consumption can be achieved with an air cooled condenser. Solar heat at moderate temperatures around 200°C can be utilized for augmentation of conventional steam-injection gas turbine power plants. Solar concentrating collectors for such an application can be simpler and less expensive than collectors used for current solar power plants. We perform a thermodynamic analysis of this hybrid cycle. High levels of steam-to-air ratio are investigated, leading to high power augmentation compared to the simple cycle and to conventional STIG. The Solar Fraction can reach up to 50% at the highest augmentation levels. The overall conversion efficiency from heat to electricity (average over fuel and solar contributions) can be in the range of 40–55% for typical candidate turbines. The incremental efficiency (corresponding to the added steam beyond conventional STIG) is in the range of 22–37%, corresponding to solar-to-electricity efficiency of about 15–24%, similar to and even exceeding current solar power plants using higher temperature collectors. The injected water can be recovered and recycled leading to very low water consumption of the cycle, but a very low cost condenser is required to make water recovery feasible.
ISSN:0038-092X
1471-1257
DOI:10.1016/j.solener.2011.09.020